Lifting jack



.MaylS, 1923. 7 1,455,622

0. B. KIRACOFE LIFTING JACK Filed 001;. 5, 1921 3 Sheets-Sheet 1 IE=- E...

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May 15, l 23.

O. B. KIRACOFE LIFTING JACK Filed Oct. 5 1921 I5 Sheets-Sheet 2 Patented May 15, 1923.

N 1'17 Q A f orno B. KIRAGOIEE, or OHUBGHVILLE, VIRGINIA.

LIFTING JACK.

Application filed October 5, 1921. Serial No. 505,517.

T 0 all w 7mm it may concern Be it known that I, OTHA B. Knmcorn, a citizen of the United States, residing at Churchville. in the county of Augusta and State of Virginia, have invented certain new and useful Improvements in Lifting Jacks; andl do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which itappertains to make and use the same.

This invention relates to a lifting jack.

An important object is to provide a construction of ack particularly useful in raising forms for concrete work so that such work may be accomplished more efficiently, with a considerable reduction in the time, labor and expense involved.

It is also aimed to provide a construction of lifting jack which may be operated by fluid pressure and which is capable of operation in different adjusted positions as the work progresses, and which is of general construction hereinafter described in connection with accompanying drawings illustrating one practical embodiment thereof.

Additional objects and advantages will appear from said description.

In the drawings Figure 1 is a side elevation;

Figure 2 is an end elevation;

Figure3 is a vertical sectional view;

Figure 4 is a plan view;

Figure 5 is a cross section on the line 5-5 of Figure 1;

Figure 6 is a cross section on the line 66 of Figure 1;

Figure 7 is a cross section on the line 77 of Figure 1, and 1 Figure Sis a letail view illustrating a modified form of the levers.

Referring specifically to the drawings, wherein like reference characters designate like or similar parts, 8 designates a vertical rod,'such as is usually empoyed in pluralities, to reinforce concrete work at its lower end, being first'embedded therein or otherwise fastened thereto. Rod 8 therefor is to be considered as extendingvertically from concrete work. An attaching or base plate 9 has an opening 10 therethrough, to receive rod 8 on which plate 9 slide. Plate 9 is adapted to be fastenedfin any suitable manner, as by means of screws, insertible through openings 11, into the form or part to be raised or e evated. Surrounding a part of the rod 8 and rigid with late 9, is a yoke 12, between the arms of which a dog 13 is positioned, being pivoted upon a pin 1 1 removably secured in the arms of the yoke by means of removable potter pins or the like 15. This lever 13 has a cam serrated face 1 1 which fits into binding relation against the rod 8, by means of asuitable spring 16 having a portion 17 wrapped upon. the lever, and a portion secured to the base as at 18. The shape of the face 14* is such however that when the base plate 9 is elevated, the lever 13 will automatically yield to permit such movement but that when the plate reaches the adjusted position and is released, the spring 16 maintains the face 1 1 in binding engagement with the rods 8, so that'descent or fastening of the base plate 9 along the rod 8 is prohibited.

Rising from the fastening or base plate 9, at any suitable location, are a plurality of rods 19. These rods lead to a head plate 20. Both plates 9 and 20 preferably have openings therethrough to removably receive the rods 19. Both ends of said rods 19 are provided with screw threads and nuts 21 work on'the screw threads and engage opposite faces of the plate, to rigidly secure the rod and plates together- Plate 9 is preferably reinforced at 22, where the rods 19 passtherethrough and preferably recessed as at 23, to receive the lowermost bolts 21, and to enable the lower surface of plate 9 to be plane, that is without projection, in order to more intimately engage the form to which it is attached.

Plate 20 may be cut away as at 24 to accommodate the uppermost nuts 21 and such plate has a central opening 25, through which rod 8 passes and on which it is slidably' mounted. One or more cylinders 26, preferably in the form of tubes open at each end, may depend from the head plate 20. Any suitable means may be utilized in attaching cylinders 26 toplates 20 but as shown, the head plate 20 is provided with recesses 27, having their annular wall provided with screw threads, engaged by screw threads on cylinders 26 at 28. A manifold passageway 29 is cut in the head 20 and opposite ends communicate with the recesses 27 and cylinders 26. Communicating with passageway 29 is an inlet port 30 and an e).- haust port 31. Pipes or conduits 32 and 33, respectively, communicates with ports 30 and .3 Pipe 30 has a cut at valve -tthere in, and pipe3l= has-acut oli valve there-shifting the valve 34 to'closed position and a in. An actuating rod member 36 is connected to valve 341.

Suitable pistons are slidable within the cylinders and they preferably consist of heads 87 from .which angulai'ly disposed guide ribs 38 depend. Head 37 has-a plurality of openings therethrough accommodating bolts 39 which pass removably through retaining discs- 40 and leather or other vwashers' ll, secured l11'- place intermediate discsl-O- and heads 87. Attaching plates may be provided preferably integral with the ribs 38 at each end as at 4-2 and 43.

with bolts 89' passing removably through the former. Plates 13 may removably se cure' apiston base plate 44 in place, through the medium of bolts 4l5-,--which may'pass through intermediate, discs 46. A guide eyelet or the equivalent 4? is provided on base 44, through which the rods 36 is slidably mounted. The lower end' of the rod may have an abutment 4:8 thereon, for instance as several nuts as shown.

Centrally or the plate 4%, an opening 49 is provided through which rod. 8 extends and 'on which the plate 44 is slidably mounted. Parallel upstanding bars 50' are formed, preferably integral with plate 4.4 and placed on opposite sides of the opening 49'. On oppositeksides of the rod 8, and

intermediate bars 50, dogs 51 are disposed, "being pivoted on removal pins mounted by bars 50and held in place as by means of cotter keys or the like 53. The inner ends of these bars are arcuate and serrated as at 54 so as to bind against rod 8 to prevent descent of the plate 44 and parts supported tening end at 60. Springs 16 and 55 are similar.

With the rod 8 securely anchored and ris-- ing from a wall-or cement work, for in stance, and with the fastening plate 9 secured tothe work. a supply of operating fluid, from any desired source. is admitted through port 30 with the valve 34: properly adjusted, through manipulation of the rod 36. The power medium thus enters, manitold29 and the cylinders 26, and through pressure. against the piston structures.

causes the head 20 to rise and accordingly the :lastening plate 9; together with the form attached thereto. When such form has been lifted or elevated to the desired extent.

5 movement-of the head 20 will have elevated the rod 36, bringing theabutment 48 into contact With'th eyelet or abutment47, thus thus cutting off the supply of operating fluid and arresting lifting movement. Thereafter, when it is desired to elevate the form to a greater height, pressure in the cy1in ders 26 is released by operation of the valve 35. l Vhen thus relieved, plate ll is elevated on the rodS with the dogs 51 yielding to facilitate the raising thereof and coacting with the rod 8 to prevent descentjas described. Power fluid may then be again ad 'mitted through port 30 so that its action within the cylinders 26 will again raise the head 20, the plate 9 attached thereto and the form attached toi astening plate 9.

Changes within the spirit and scope may be resorted to.

I claim as my.invention-,:

l. A- li'tting jack having a lifting section, provided with a base, amounting member on which said base is slidable, a second base.

said second base being slidable with said mounting member, means on said bases to rection and toresist sliding movement thereo'l in the opposite direction, a cooperating 2. A lifting jack consisting of ahead, an,

attachingplatedepending from the head, a supporting member relatively to which said head and attaching plate slide, means to secure the plate to the supporting member against movement longitudinally there of in one direction, a supporting plate slidable on the supporting member, means to secure the supporting plate to the supporting member against movement longitudinally thereof in one direction, a piston permitsliding movement thereof in one d-ion one of said plates, a cylinder on the other i of said plates cooperating with the piston, and means for supply and exhaust of a power fluid to and from said cylinder.

3. A lifting jachiin combination withj a supporting rod a plate slidable on the rod,

a dog on said plate for engagement with "the rod to prevent descent of the plate,"a

head slidable on the rod, rods connecting said head and said plate, cylinders having an inlet and an exhaust passageway'between said ports and said cylinder, a supporting plate sl dable on the support, a dog pivoted to said supporting plate and engageable 'OTHA. B. KIRACOFE.

In testimony whereof- I affix mysignaturer.

Witnesses: J. .B. THOMPSON,

J. W. Knmoorn.

Q with the supporting member to prevent 'de- 1 "scent of the supporting member, pistons on 

